1 //===-- IRInterpreter.cpp ---------------------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #include "lldb/Core/DataEncoder.h" 11 #include "lldb/Core/Log.h" 12 #include "lldb/Core/ValueObjectConstResult.h" 13 #include "lldb/Expression/ClangExpressionDeclMap.h" 14 #include "lldb/Expression/ClangExpressionVariable.h" 15 #include "lldb/Expression/IRForTarget.h" 16 #include "lldb/Expression/IRInterpreter.h" 17 18 #include "llvm/IR/Constants.h" 19 #include "llvm/IR/Function.h" 20 #include "llvm/IR/Instructions.h" 21 #include "llvm/IR/Module.h" 22 #include "llvm/Support/raw_ostream.h" 23 #include "llvm/IR/DataLayout.h" 24 25 #include <map> 26 27 using namespace llvm; 28 29 IRInterpreter::IRInterpreter(lldb_private::ClangExpressionDeclMap &decl_map, 30 lldb_private::Stream *error_stream) : 31 m_decl_map(decl_map) 32 { 33 34 } 35 36 IRInterpreter::~IRInterpreter() 37 { 38 39 } 40 41 static std::string 42 PrintValue(const Value *value, bool truncate = false) 43 { 44 std::string s; 45 raw_string_ostream rso(s); 46 value->print(rso); 47 rso.flush(); 48 if (truncate) 49 s.resize(s.length() - 1); 50 51 size_t offset; 52 while ((offset = s.find('\n')) != s.npos) 53 s.erase(offset, 1); 54 while (s[0] == ' ' || s[0] == '\t') 55 s.erase(0, 1); 56 57 return s; 58 } 59 60 static std::string 61 PrintType(const Type *type, bool truncate = false) 62 { 63 std::string s; 64 raw_string_ostream rso(s); 65 type->print(rso); 66 rso.flush(); 67 if (truncate) 68 s.resize(s.length() - 1); 69 return s; 70 } 71 72 typedef STD_SHARED_PTR(lldb_private::DataEncoder) DataEncoderSP; 73 typedef STD_SHARED_PTR(lldb_private::DataExtractor) DataExtractorSP; 74 75 class Memory 76 { 77 public: 78 typedef uint32_t index_t; 79 80 struct Allocation 81 { 82 // m_virtual_address is always the address of the variable in the virtual memory 83 // space provided by Memory. 84 // 85 // m_origin is always non-NULL and describes the source of the data (possibly 86 // m_data if this allocation is the authoritative source). 87 // 88 // Possible value configurations: 89 // 90 // Allocation type getValueType() getContextType() m_origin->GetScalar() m_data 91 // ========================================================================================================================= 92 // FileAddress eValueTypeFileAddress eContextTypeInvalid A location in a binary NULL 93 // image 94 // 95 // LoadAddress eValueTypeLoadAddress eContextTypeInvalid A location in the target's NULL 96 // virtual memory 97 // 98 // Alloca eValueTypeHostAddress eContextTypeInvalid == m_data->GetBytes() Deleted at end of 99 // execution 100 // 101 // PersistentVar eValueTypeHostAddress eContextTypeClangType A persistent variable's NULL 102 // location in LLDB's memory 103 // 104 // Register [ignored] eContextTypeRegister [ignored] Flushed to the register 105 // at the end of execution 106 107 lldb::addr_t m_virtual_address; 108 size_t m_extent; 109 lldb_private::Value m_origin; 110 lldb::DataBufferSP m_data; 111 112 Allocation (lldb::addr_t virtual_address, 113 size_t extent, 114 lldb::DataBufferSP data) : 115 m_virtual_address(virtual_address), 116 m_extent(extent), 117 m_data(data) 118 { 119 } 120 121 Allocation (const Allocation &allocation) : 122 m_virtual_address(allocation.m_virtual_address), 123 m_extent(allocation.m_extent), 124 m_origin(allocation.m_origin), 125 m_data(allocation.m_data) 126 { 127 } 128 }; 129 130 typedef STD_SHARED_PTR(Allocation) AllocationSP; 131 132 struct Region 133 { 134 AllocationSP m_allocation; 135 uint64_t m_base; 136 uint64_t m_extent; 137 138 Region () : 139 m_allocation(), 140 m_base(0), 141 m_extent(0) 142 { 143 } 144 145 Region (AllocationSP allocation, uint64_t base, uint64_t extent) : 146 m_allocation(allocation), 147 m_base(base), 148 m_extent(extent) 149 { 150 } 151 152 Region (const Region ®ion) : 153 m_allocation(region.m_allocation), 154 m_base(region.m_base), 155 m_extent(region.m_extent) 156 { 157 } 158 159 bool IsValid () 160 { 161 return (bool) m_allocation; 162 } 163 164 bool IsInvalid () 165 { 166 return !m_allocation; 167 } 168 }; 169 170 typedef std::vector <AllocationSP> MemoryMap; 171 172 private: 173 lldb::addr_t m_addr_base; 174 lldb::addr_t m_addr_max; 175 MemoryMap m_memory; 176 lldb::ByteOrder m_byte_order; 177 lldb::addr_t m_addr_byte_size; 178 DataLayout &m_target_data; 179 180 lldb_private::ClangExpressionDeclMap &m_decl_map; 181 182 MemoryMap::iterator LookupInternal (lldb::addr_t addr) 183 { 184 for (MemoryMap::iterator i = m_memory.begin(), e = m_memory.end(); 185 i != e; 186 ++i) 187 { 188 if ((*i)->m_virtual_address <= addr && 189 (*i)->m_virtual_address + (*i)->m_extent > addr) 190 return i; 191 } 192 193 return m_memory.end(); 194 } 195 196 public: 197 Memory (DataLayout &target_data, 198 lldb_private::ClangExpressionDeclMap &decl_map, 199 lldb::addr_t alloc_start, 200 lldb::addr_t alloc_max) : 201 m_addr_base(alloc_start), 202 m_addr_max(alloc_max), 203 m_target_data(target_data), 204 m_decl_map(decl_map) 205 { 206 m_byte_order = (target_data.isLittleEndian() ? lldb::eByteOrderLittle : lldb::eByteOrderBig); 207 m_addr_byte_size = (target_data.getPointerSize(0)); 208 } 209 210 Region Malloc (size_t size, size_t align) 211 { 212 lldb::DataBufferSP data(new lldb_private::DataBufferHeap(size, 0)); 213 214 if (data) 215 { 216 index_t index = m_memory.size(); 217 218 const size_t mask = (align - 1); 219 220 m_addr_base += mask; 221 m_addr_base &= ~mask; 222 223 if (m_addr_base + size < m_addr_base || 224 m_addr_base + size > m_addr_max) 225 return Region(); 226 227 uint64_t base = m_addr_base; 228 229 m_memory.push_back(AllocationSP(new Allocation(base, size, data))); 230 231 m_addr_base += size; 232 233 AllocationSP alloc = m_memory[index]; 234 235 alloc->m_origin.GetScalar() = (unsigned long long)data->GetBytes(); 236 alloc->m_origin.SetContext(lldb_private::Value::eContextTypeInvalid, NULL); 237 alloc->m_origin.SetValueType(lldb_private::Value::eValueTypeHostAddress); 238 239 return Region(alloc, base, size); 240 } 241 242 return Region(); 243 } 244 245 Region Malloc (Type *type) 246 { 247 return Malloc (m_target_data.getTypeAllocSize(type), 248 m_target_data.getPrefTypeAlignment(type)); 249 } 250 251 Region Place (Type *type, lldb::addr_t base, lldb_private::Value &value) 252 { 253 index_t index = m_memory.size(); 254 size_t size = m_target_data.getTypeAllocSize(type); 255 256 m_memory.push_back(AllocationSP(new Allocation(base, size, lldb::DataBufferSP()))); 257 258 AllocationSP alloc = m_memory[index]; 259 260 alloc->m_origin = value; 261 262 return Region(alloc, base, size); 263 } 264 265 void Free (lldb::addr_t addr) 266 { 267 MemoryMap::iterator i = LookupInternal (addr); 268 269 if (i != m_memory.end()) 270 m_memory.erase(i); 271 } 272 273 Region Lookup (lldb::addr_t addr, Type *type) 274 { 275 MemoryMap::iterator i = LookupInternal(addr); 276 277 if (i == m_memory.end() || !type->isSized()) 278 return Region(); 279 280 size_t size = m_target_data.getTypeStoreSize(type); 281 282 return Region(*i, addr, size); 283 } 284 285 DataEncoderSP GetEncoder (Region region) 286 { 287 if (region.m_allocation->m_origin.GetValueType() != lldb_private::Value::eValueTypeHostAddress) 288 return DataEncoderSP(); 289 290 lldb::DataBufferSP buffer = region.m_allocation->m_data; 291 292 if (!buffer) 293 return DataEncoderSP(); 294 295 size_t base_offset = (size_t)(region.m_base - region.m_allocation->m_virtual_address); 296 297 return DataEncoderSP(new lldb_private::DataEncoder(buffer->GetBytes() + base_offset, region.m_extent, m_byte_order, m_addr_byte_size)); 298 } 299 300 DataExtractorSP GetExtractor (Region region) 301 { 302 if (region.m_allocation->m_origin.GetValueType() != lldb_private::Value::eValueTypeHostAddress) 303 return DataExtractorSP(); 304 305 lldb::DataBufferSP buffer = region.m_allocation->m_data; 306 size_t base_offset = (size_t)(region.m_base - region.m_allocation->m_virtual_address); 307 308 if (buffer) 309 return DataExtractorSP(new lldb_private::DataExtractor(buffer->GetBytes() + base_offset, region.m_extent, m_byte_order, m_addr_byte_size)); 310 else 311 return DataExtractorSP(new lldb_private::DataExtractor((uint8_t*)region.m_allocation->m_origin.GetScalar().ULongLong() + base_offset, region.m_extent, m_byte_order, m_addr_byte_size)); 312 } 313 314 lldb_private::Value GetAccessTarget(lldb::addr_t addr) 315 { 316 MemoryMap::iterator i = LookupInternal(addr); 317 318 if (i == m_memory.end()) 319 return lldb_private::Value(); 320 321 lldb_private::Value target = (*i)->m_origin; 322 323 if (target.GetContextType() == lldb_private::Value::eContextTypeRegisterInfo) 324 { 325 target.SetContext(lldb_private::Value::eContextTypeInvalid, NULL); 326 target.SetValueType(lldb_private::Value::eValueTypeHostAddress); 327 target.GetScalar() = (unsigned long long)(*i)->m_data->GetBytes(); 328 } 329 330 target.GetScalar() += (addr - (*i)->m_virtual_address); 331 332 return target; 333 } 334 335 bool Write (lldb::addr_t addr, const uint8_t *data, size_t length) 336 { 337 lldb_private::Value target = GetAccessTarget(addr); 338 339 return m_decl_map.WriteTarget(target, data, length); 340 } 341 342 bool Read (uint8_t *data, lldb::addr_t addr, size_t length) 343 { 344 lldb_private::Value source = GetAccessTarget(addr); 345 346 return m_decl_map.ReadTarget(data, source, length); 347 } 348 349 bool WriteToRawPtr (lldb::addr_t addr, const uint8_t *data, size_t length) 350 { 351 lldb_private::Value target = m_decl_map.WrapBareAddress(addr); 352 353 return m_decl_map.WriteTarget(target, data, length); 354 } 355 356 bool ReadFromRawPtr (uint8_t *data, lldb::addr_t addr, size_t length) 357 { 358 lldb_private::Value source = m_decl_map.WrapBareAddress(addr); 359 360 return m_decl_map.ReadTarget(data, source, length); 361 } 362 363 std::string PrintData (lldb::addr_t addr, size_t length) 364 { 365 lldb_private::Value target = GetAccessTarget(addr); 366 367 lldb_private::DataBufferHeap buf(length, 0); 368 369 if (!m_decl_map.ReadTarget(buf.GetBytes(), target, length)) 370 return std::string("<couldn't read data>"); 371 372 lldb_private::StreamString ss; 373 374 for (size_t i = 0; i < length; i++) 375 { 376 if ((!(i & 0xf)) && i) 377 ss.Printf("%02hhx - ", buf.GetBytes()[i]); 378 else 379 ss.Printf("%02hhx ", buf.GetBytes()[i]); 380 } 381 382 return ss.GetString(); 383 } 384 385 std::string SummarizeRegion (Region ®ion) 386 { 387 lldb_private::StreamString ss; 388 389 lldb_private::Value base = GetAccessTarget(region.m_base); 390 391 ss.Printf("%" PRIx64 " [%s - %s %llx]", 392 region.m_base, 393 lldb_private::Value::GetValueTypeAsCString(base.GetValueType()), 394 lldb_private::Value::GetContextTypeAsCString(base.GetContextType()), 395 base.GetScalar().ULongLong()); 396 397 ss.Printf(" %s", PrintData(region.m_base, region.m_extent).c_str()); 398 399 return ss.GetString(); 400 } 401 }; 402 403 class InterpreterStackFrame 404 { 405 public: 406 typedef std::map <const Value*, Memory::Region> ValueMap; 407 408 ValueMap m_values; 409 Memory &m_memory; 410 DataLayout &m_target_data; 411 lldb_private::ClangExpressionDeclMap &m_decl_map; 412 const BasicBlock *m_bb; 413 BasicBlock::const_iterator m_ii; 414 BasicBlock::const_iterator m_ie; 415 416 lldb::ByteOrder m_byte_order; 417 size_t m_addr_byte_size; 418 419 InterpreterStackFrame (DataLayout &target_data, 420 Memory &memory, 421 lldb_private::ClangExpressionDeclMap &decl_map) : 422 m_memory (memory), 423 m_target_data (target_data), 424 m_decl_map (decl_map) 425 { 426 m_byte_order = (target_data.isLittleEndian() ? lldb::eByteOrderLittle : lldb::eByteOrderBig); 427 m_addr_byte_size = (target_data.getPointerSize(0)); 428 } 429 430 void Jump (const BasicBlock *bb) 431 { 432 m_bb = bb; 433 m_ii = m_bb->begin(); 434 m_ie = m_bb->end(); 435 } 436 437 bool Cache (Memory::AllocationSP allocation, Type *type) 438 { 439 if (allocation->m_origin.GetContextType() != lldb_private::Value::eContextTypeRegisterInfo) 440 return false; 441 442 return m_decl_map.ReadTarget(allocation->m_data->GetBytes(), allocation->m_origin, allocation->m_data->GetByteSize()); 443 } 444 445 std::string SummarizeValue (const Value *value) 446 { 447 lldb_private::StreamString ss; 448 449 ss.Printf("%s", PrintValue(value).c_str()); 450 451 ValueMap::iterator i = m_values.find(value); 452 453 if (i != m_values.end()) 454 { 455 Memory::Region region = i->second; 456 457 ss.Printf(" %s", m_memory.SummarizeRegion(region).c_str()); 458 } 459 460 return ss.GetString(); 461 } 462 463 bool AssignToMatchType (lldb_private::Scalar &scalar, uint64_t u64value, Type *type) 464 { 465 size_t type_size = m_target_data.getTypeStoreSize(type); 466 467 switch (type_size) 468 { 469 case 1: 470 scalar = (uint8_t)u64value; 471 break; 472 case 2: 473 scalar = (uint16_t)u64value; 474 break; 475 case 4: 476 scalar = (uint32_t)u64value; 477 break; 478 case 8: 479 scalar = (uint64_t)u64value; 480 break; 481 default: 482 return false; 483 } 484 485 return true; 486 } 487 488 bool EvaluateValue (lldb_private::Scalar &scalar, const Value *value, Module &module) 489 { 490 const Constant *constant = dyn_cast<Constant>(value); 491 492 if (constant) 493 { 494 if (const ConstantInt *constant_int = dyn_cast<ConstantInt>(constant)) 495 { 496 return AssignToMatchType(scalar, constant_int->getLimitedValue(), value->getType()); 497 } 498 } 499 else 500 { 501 Memory::Region region = ResolveValue(value, module); 502 DataExtractorSP value_extractor = m_memory.GetExtractor(region); 503 504 if (!value_extractor) 505 return false; 506 507 size_t value_size = m_target_data.getTypeStoreSize(value->getType()); 508 509 lldb::offset_t offset = 0; 510 uint64_t u64value = value_extractor->GetMaxU64(&offset, value_size); 511 512 return AssignToMatchType(scalar, u64value, value->getType()); 513 } 514 515 return false; 516 } 517 518 bool AssignValue (const Value *value, lldb_private::Scalar &scalar, Module &module) 519 { 520 Memory::Region region = ResolveValue (value, module); 521 522 lldb_private::Scalar cast_scalar; 523 524 if (!AssignToMatchType(cast_scalar, scalar.GetRawBits64(0), value->getType())) 525 return false; 526 527 lldb_private::DataBufferHeap buf(cast_scalar.GetByteSize(), 0); 528 529 lldb_private::Error err; 530 531 if (!cast_scalar.GetAsMemoryData(buf.GetBytes(), buf.GetByteSize(), m_byte_order, err)) 532 return false; 533 534 DataEncoderSP region_encoder = m_memory.GetEncoder(region); 535 536 if (buf.GetByteSize() > region_encoder->GetByteSize()) 537 return false; // TODO figure out why this happens; try "expr int i = 12; i" 538 539 memcpy(region_encoder->GetDataStart(), buf.GetBytes(), buf.GetByteSize()); 540 541 return true; 542 } 543 544 bool ResolveConstantValue (APInt &value, const Constant *constant) 545 { 546 if (const ConstantInt *constant_int = dyn_cast<ConstantInt>(constant)) 547 { 548 value = constant_int->getValue(); 549 return true; 550 } 551 else if (const ConstantFP *constant_fp = dyn_cast<ConstantFP>(constant)) 552 { 553 value = constant_fp->getValueAPF().bitcastToAPInt(); 554 return true; 555 } 556 else if (const ConstantExpr *constant_expr = dyn_cast<ConstantExpr>(constant)) 557 { 558 switch (constant_expr->getOpcode()) 559 { 560 default: 561 return false; 562 case Instruction::IntToPtr: 563 case Instruction::PtrToInt: 564 case Instruction::BitCast: 565 return ResolveConstantValue(value, constant_expr->getOperand(0)); 566 case Instruction::GetElementPtr: 567 { 568 ConstantExpr::const_op_iterator op_cursor = constant_expr->op_begin(); 569 ConstantExpr::const_op_iterator op_end = constant_expr->op_end(); 570 571 Constant *base = dyn_cast<Constant>(*op_cursor); 572 573 if (!base) 574 return false; 575 576 if (!ResolveConstantValue(value, base)) 577 return false; 578 579 op_cursor++; 580 581 if (op_cursor == op_end) 582 return true; // no offset to apply! 583 584 SmallVector <Value *, 8> indices (op_cursor, op_end); 585 586 uint64_t offset = m_target_data.getIndexedOffset(base->getType(), indices); 587 588 const bool is_signed = true; 589 value += APInt(value.getBitWidth(), offset, is_signed); 590 591 return true; 592 } 593 } 594 } 595 596 return false; 597 } 598 599 bool ResolveConstant (Memory::Region ®ion, const Constant *constant) 600 { 601 APInt resolved_value; 602 603 if (!ResolveConstantValue(resolved_value, constant)) 604 return false; 605 606 const uint64_t *raw_data = resolved_value.getRawData(); 607 608 size_t constant_size = m_target_data.getTypeStoreSize(constant->getType()); 609 return m_memory.Write(region.m_base, (const uint8_t*)raw_data, constant_size); 610 } 611 612 Memory::Region ResolveValue (const Value *value, Module &module) 613 { 614 ValueMap::iterator i = m_values.find(value); 615 616 if (i != m_values.end()) 617 return i->second; 618 619 const GlobalValue *global_value = dyn_cast<GlobalValue>(value); 620 621 // If the variable is indirected through the argument 622 // array then we need to build an extra level of indirection 623 // for it. This is the default; only magic arguments like 624 // "this", "self", and "_cmd" are direct. 625 bool variable_is_this = false; 626 627 // Attempt to resolve the value using the program's data. 628 // If it is, the values to be created are: 629 // 630 // data_region - a region of memory in which the variable's data resides. 631 // ref_region - a region of memory in which its address (i.e., &var) resides. 632 // In the JIT case, this region would be a member of the struct passed in. 633 // pointer_region - a region of memory in which the address of the pointer 634 // resides. This is an IR-level variable. 635 do 636 { 637 lldb::LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS)); 638 639 lldb_private::Value resolved_value; 640 lldb_private::ClangExpressionVariable::FlagType flags = 0; 641 642 if (global_value) 643 { 644 clang::NamedDecl *decl = IRForTarget::DeclForGlobal(global_value, &module); 645 646 if (!decl) 647 break; 648 649 if (isa<clang::FunctionDecl>(decl)) 650 { 651 if (log) 652 log->Printf("The interpreter does not handle function pointers at the moment"); 653 654 return Memory::Region(); 655 } 656 657 resolved_value = m_decl_map.LookupDecl(decl, flags); 658 } 659 else 660 { 661 // Special-case "this", "self", and "_cmd" 662 663 std::string name_str = value->getName().str(); 664 665 if (name_str == "this" || 666 name_str == "self" || 667 name_str == "_cmd") 668 resolved_value = m_decl_map.GetSpecialValue(lldb_private::ConstString(name_str.c_str())); 669 670 variable_is_this = true; 671 } 672 673 if (resolved_value.GetScalar().GetType() != lldb_private::Scalar::e_void) 674 { 675 if (resolved_value.GetContextType() == lldb_private::Value::eContextTypeRegisterInfo) 676 { 677 if (variable_is_this) 678 { 679 Memory::Region data_region = m_memory.Place(value->getType(), resolved_value.GetScalar().ULongLong(), resolved_value); 680 681 lldb_private::Value origin; 682 683 origin.SetValueType(lldb_private::Value::eValueTypeLoadAddress); 684 origin.SetContext(lldb_private::Value::eContextTypeInvalid, NULL); 685 origin.GetScalar() = resolved_value.GetScalar(); 686 687 data_region.m_allocation->m_origin = origin; 688 689 Memory::Region ref_region = m_memory.Malloc(value->getType()); 690 691 if (ref_region.IsInvalid()) 692 return Memory::Region(); 693 694 DataEncoderSP ref_encoder = m_memory.GetEncoder(ref_region); 695 696 if (ref_encoder->PutAddress(0, data_region.m_base) == UINT32_MAX) 697 return Memory::Region(); 698 699 if (log) 700 { 701 log->Printf("Made an allocation for \"this\" register variable %s", PrintValue(value).c_str()); 702 log->Printf(" Data region : %llx", (unsigned long long)data_region.m_base); 703 log->Printf(" Ref region : %llx", (unsigned long long)ref_region.m_base); 704 } 705 706 m_values[value] = ref_region; 707 return ref_region; 708 } 709 else if (flags & lldb_private::ClangExpressionVariable::EVBareRegister) 710 { 711 lldb_private::RegisterInfo *reg_info = resolved_value.GetRegisterInfo(); 712 Memory::Region data_region = (reg_info->encoding == lldb::eEncodingVector) ? 713 m_memory.Malloc(reg_info->byte_size, m_target_data.getPrefTypeAlignment(value->getType())) : 714 m_memory.Malloc(value->getType()); 715 716 data_region.m_allocation->m_origin = resolved_value; 717 Memory::Region ref_region = m_memory.Malloc(value->getType()); 718 719 if (!Cache(data_region.m_allocation, value->getType())) 720 return Memory::Region(); 721 722 if (ref_region.IsInvalid()) 723 return Memory::Region(); 724 725 DataEncoderSP ref_encoder = m_memory.GetEncoder(ref_region); 726 727 if (ref_encoder->PutAddress(0, data_region.m_base) == UINT32_MAX) 728 return Memory::Region(); 729 730 if (log) 731 { 732 log->Printf("Made an allocation for bare register variable %s", PrintValue(value).c_str()); 733 log->Printf(" Data contents : %s", m_memory.PrintData(data_region.m_base, data_region.m_extent).c_str()); 734 log->Printf(" Data region : %llx", (unsigned long long)data_region.m_base); 735 log->Printf(" Ref region : %llx", (unsigned long long)ref_region.m_base); 736 } 737 738 m_values[value] = ref_region; 739 return ref_region; 740 } 741 else 742 { 743 lldb_private::RegisterInfo *reg_info = resolved_value.GetRegisterInfo(); 744 Memory::Region data_region = (reg_info->encoding == lldb::eEncodingVector) ? 745 m_memory.Malloc(reg_info->byte_size, m_target_data.getPrefTypeAlignment(value->getType())) : 746 m_memory.Malloc(value->getType()); 747 748 data_region.m_allocation->m_origin = resolved_value; 749 Memory::Region ref_region = m_memory.Malloc(value->getType()); 750 Memory::Region pointer_region; 751 752 pointer_region = m_memory.Malloc(value->getType()); 753 754 if (!Cache(data_region.m_allocation, value->getType())) 755 return Memory::Region(); 756 757 if (ref_region.IsInvalid()) 758 return Memory::Region(); 759 760 if (pointer_region.IsInvalid()) 761 return Memory::Region(); 762 763 DataEncoderSP ref_encoder = m_memory.GetEncoder(ref_region); 764 765 if (ref_encoder->PutAddress(0, data_region.m_base) == UINT32_MAX) 766 return Memory::Region(); 767 768 if (log) 769 { 770 log->Printf("Made an allocation for ordinary register variable %s", PrintValue(value).c_str()); 771 log->Printf(" Data contents : %s", m_memory.PrintData(data_region.m_base, data_region.m_extent).c_str()); 772 log->Printf(" Data region : %llx", (unsigned long long)data_region.m_base); 773 log->Printf(" Ref region : %llx", (unsigned long long)ref_region.m_base); 774 log->Printf(" Pointer region : %llx", (unsigned long long)pointer_region.m_base); 775 } 776 777 DataEncoderSP pointer_encoder = m_memory.GetEncoder(pointer_region); 778 779 if (pointer_encoder->PutAddress(0, ref_region.m_base) == UINT32_MAX) 780 return Memory::Region(); 781 782 m_values[value] = pointer_region; 783 return pointer_region; 784 } 785 } 786 else 787 { 788 Memory::Region data_region = m_memory.Place(value->getType(), resolved_value.GetScalar().ULongLong(), resolved_value); 789 Memory::Region ref_region = m_memory.Malloc(value->getType()); 790 Memory::Region pointer_region; 791 792 if (!variable_is_this) 793 pointer_region = m_memory.Malloc(value->getType()); 794 795 if (ref_region.IsInvalid()) 796 return Memory::Region(); 797 798 if (pointer_region.IsInvalid() && !variable_is_this) 799 return Memory::Region(); 800 801 DataEncoderSP ref_encoder = m_memory.GetEncoder(ref_region); 802 803 if (ref_encoder->PutAddress(0, data_region.m_base) == UINT32_MAX) 804 return Memory::Region(); 805 806 if (!variable_is_this) 807 { 808 DataEncoderSP pointer_encoder = m_memory.GetEncoder(pointer_region); 809 810 if (pointer_encoder->PutAddress(0, ref_region.m_base) == UINT32_MAX) 811 return Memory::Region(); 812 813 m_values[value] = pointer_region; 814 } 815 816 if (log) 817 { 818 log->Printf("Made an allocation for %s", PrintValue(value).c_str()); 819 log->Printf(" Data contents : %s", m_memory.PrintData(data_region.m_base, data_region.m_extent).c_str()); 820 log->Printf(" Data region : %llx", (unsigned long long)data_region.m_base); 821 log->Printf(" Ref region : %llx", (unsigned long long)ref_region.m_base); 822 if (!variable_is_this) 823 log->Printf(" Pointer region : %llx", (unsigned long long)pointer_region.m_base); 824 } 825 826 if (variable_is_this) 827 return ref_region; 828 else 829 return pointer_region; 830 } 831 } 832 } 833 while(0); 834 835 // Fall back and allocate space [allocation type Alloca] 836 837 Type *type = value->getType(); 838 839 lldb::ValueSP backing_value(new lldb_private::Value); 840 841 Memory::Region data_region = m_memory.Malloc(type); 842 data_region.m_allocation->m_origin.GetScalar() = (unsigned long long)data_region.m_allocation->m_data->GetBytes(); 843 data_region.m_allocation->m_origin.SetContext(lldb_private::Value::eContextTypeInvalid, NULL); 844 data_region.m_allocation->m_origin.SetValueType(lldb_private::Value::eValueTypeHostAddress); 845 846 const Constant *constant = dyn_cast<Constant>(value); 847 848 do 849 { 850 if (!constant) 851 break; 852 853 if (!ResolveConstant (data_region, constant)) 854 return Memory::Region(); 855 } 856 while(0); 857 858 m_values[value] = data_region; 859 return data_region; 860 } 861 862 bool ConstructResult (lldb::ClangExpressionVariableSP &result, 863 const GlobalValue *result_value, 864 const lldb_private::ConstString &result_name, 865 lldb_private::TypeFromParser result_type, 866 Module &module) 867 { 868 // The result_value resolves to P, a pointer to a region R containing the result data. 869 // If the result variable is a reference, the region R contains a pointer to the result R_final in the original process. 870 871 if (!result_value) 872 return true; // There was no slot for a result – the expression doesn't return one. 873 874 ValueMap::iterator i = m_values.find(result_value); 875 876 if (i == m_values.end()) 877 return false; // There was a slot for the result, but we didn't write into it. 878 879 Memory::Region P = i->second; 880 DataExtractorSP P_extractor = m_memory.GetExtractor(P); 881 882 if (!P_extractor) 883 return false; 884 885 Type *pointer_ty = result_value->getType(); 886 PointerType *pointer_ptr_ty = dyn_cast<PointerType>(pointer_ty); 887 if (!pointer_ptr_ty) 888 return false; 889 Type *R_ty = pointer_ptr_ty->getElementType(); 890 891 lldb::offset_t offset = 0; 892 lldb::addr_t pointer = P_extractor->GetAddress(&offset); 893 894 Memory::Region R = m_memory.Lookup(pointer, R_ty); 895 896 if (R.m_allocation->m_origin.GetValueType() != lldb_private::Value::eValueTypeHostAddress || 897 !R.m_allocation->m_data) 898 return false; 899 900 lldb_private::Value base; 901 902 bool transient = false; 903 bool maybe_make_load = false; 904 905 if (m_decl_map.ResultIsReference(result_name)) 906 { 907 PointerType *R_ptr_ty = dyn_cast<PointerType>(R_ty); 908 if (!R_ptr_ty) 909 return false; 910 Type *R_final_ty = R_ptr_ty->getElementType(); 911 912 DataExtractorSP R_extractor = m_memory.GetExtractor(R); 913 914 if (!R_extractor) 915 return false; 916 917 offset = 0; 918 lldb::addr_t R_pointer = R_extractor->GetAddress(&offset); 919 920 Memory::Region R_final = m_memory.Lookup(R_pointer, R_final_ty); 921 922 if (R_final.m_allocation) 923 { 924 if (R_final.m_allocation->m_data) 925 transient = true; // this is a stack allocation 926 927 base = R_final.m_allocation->m_origin; 928 base.GetScalar() += (R_final.m_base - R_final.m_allocation->m_virtual_address); 929 } 930 else 931 { 932 // We got a bare pointer. We are going to treat it as a load address 933 // or a file address, letting decl_map make the choice based on whether 934 // or not a process exists. 935 936 base.SetContext(lldb_private::Value::eContextTypeInvalid, NULL); 937 base.SetValueType(lldb_private::Value::eValueTypeFileAddress); 938 base.GetScalar() = (unsigned long long)R_pointer; 939 maybe_make_load = true; 940 } 941 } 942 else 943 { 944 base.SetContext(lldb_private::Value::eContextTypeInvalid, NULL); 945 base.SetValueType(lldb_private::Value::eValueTypeHostAddress); 946 base.GetScalar() = (unsigned long long)R.m_allocation->m_data->GetBytes() + (R.m_base - R.m_allocation->m_virtual_address); 947 } 948 949 return m_decl_map.CompleteResultVariable (result, base, result_name, result_type, transient, maybe_make_load); 950 } 951 }; 952 953 bool 954 IRInterpreter::maybeRunOnFunction (lldb::ClangExpressionVariableSP &result, 955 const lldb_private::ConstString &result_name, 956 lldb_private::TypeFromParser result_type, 957 Function &llvm_function, 958 Module &llvm_module, 959 lldb_private::Error &err) 960 { 961 if (supportsFunction (llvm_function, err)) 962 return runOnFunction(result, 963 result_name, 964 result_type, 965 llvm_function, 966 llvm_module, 967 err); 968 else 969 return false; 970 } 971 972 static const char *unsupported_opcode_error = "Interpreter doesn't handle one of the expression's opcodes"; 973 static const char *interpreter_initialization_error = "Interpreter couldn't be initialized"; 974 static const char *interpreter_internal_error = "Interpreter encountered an internal error"; 975 static const char *bad_value_error = "Interpreter couldn't resolve a value during execution"; 976 static const char *memory_allocation_error = "Interpreter couldn't allocate memory"; 977 static const char *memory_write_error = "Interpreter couldn't write to memory"; 978 static const char *memory_read_error = "Interpreter couldn't read from memory"; 979 static const char *infinite_loop_error = "Interpreter ran for too many cycles"; 980 static const char *bad_result_error = "Result of expression is in bad memory"; 981 982 bool 983 IRInterpreter::supportsFunction (Function &llvm_function, 984 lldb_private::Error &err) 985 { 986 lldb::LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS)); 987 988 for (Function::iterator bbi = llvm_function.begin(), bbe = llvm_function.end(); 989 bbi != bbe; 990 ++bbi) 991 { 992 for (BasicBlock::iterator ii = bbi->begin(), ie = bbi->end(); 993 ii != ie; 994 ++ii) 995 { 996 switch (ii->getOpcode()) 997 { 998 default: 999 { 1000 if (log) 1001 log->Printf("Unsupported instruction: %s", PrintValue(ii).c_str()); 1002 err.SetErrorToGenericError(); 1003 err.SetErrorString(unsupported_opcode_error); 1004 return false; 1005 } 1006 case Instruction::Add: 1007 case Instruction::Alloca: 1008 case Instruction::BitCast: 1009 case Instruction::Br: 1010 case Instruction::GetElementPtr: 1011 break; 1012 case Instruction::ICmp: 1013 { 1014 ICmpInst *icmp_inst = dyn_cast<ICmpInst>(ii); 1015 1016 if (!icmp_inst) 1017 { 1018 err.SetErrorToGenericError(); 1019 err.SetErrorString(interpreter_internal_error); 1020 return false; 1021 } 1022 1023 switch (icmp_inst->getPredicate()) 1024 { 1025 default: 1026 { 1027 if (log) 1028 log->Printf("Unsupported ICmp predicate: %s", PrintValue(ii).c_str()); 1029 1030 err.SetErrorToGenericError(); 1031 err.SetErrorString(unsupported_opcode_error); 1032 return false; 1033 } 1034 case CmpInst::ICMP_EQ: 1035 case CmpInst::ICMP_NE: 1036 case CmpInst::ICMP_UGT: 1037 case CmpInst::ICMP_UGE: 1038 case CmpInst::ICMP_ULT: 1039 case CmpInst::ICMP_ULE: 1040 case CmpInst::ICMP_SGT: 1041 case CmpInst::ICMP_SGE: 1042 case CmpInst::ICMP_SLT: 1043 case CmpInst::ICMP_SLE: 1044 break; 1045 } 1046 } 1047 break; 1048 case Instruction::And: 1049 case Instruction::AShr: 1050 case Instruction::IntToPtr: 1051 case Instruction::PtrToInt: 1052 case Instruction::Load: 1053 case Instruction::LShr: 1054 case Instruction::Mul: 1055 case Instruction::Or: 1056 case Instruction::Ret: 1057 case Instruction::SDiv: 1058 case Instruction::Shl: 1059 case Instruction::SRem: 1060 case Instruction::Store: 1061 case Instruction::Sub: 1062 case Instruction::UDiv: 1063 case Instruction::URem: 1064 case Instruction::Xor: 1065 case Instruction::ZExt: 1066 break; 1067 } 1068 } 1069 } 1070 1071 return true; 1072 } 1073 1074 bool 1075 IRInterpreter::runOnFunction (lldb::ClangExpressionVariableSP &result, 1076 const lldb_private::ConstString &result_name, 1077 lldb_private::TypeFromParser result_type, 1078 Function &llvm_function, 1079 Module &llvm_module, 1080 lldb_private::Error &err) 1081 { 1082 lldb::LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS)); 1083 1084 lldb_private::ClangExpressionDeclMap::TargetInfo target_info = m_decl_map.GetTargetInfo(); 1085 1086 if (!target_info.IsValid()) 1087 { 1088 err.SetErrorToGenericError(); 1089 err.SetErrorString(interpreter_initialization_error); 1090 return false; 1091 } 1092 1093 lldb::addr_t alloc_min; 1094 lldb::addr_t alloc_max; 1095 1096 switch (target_info.address_byte_size) 1097 { 1098 default: 1099 err.SetErrorToGenericError(); 1100 err.SetErrorString(interpreter_initialization_error); 1101 return false; 1102 case 4: 1103 alloc_min = 0x00001000llu; 1104 alloc_max = 0x0000ffffllu; 1105 break; 1106 case 8: 1107 alloc_min = 0x0000000000001000llu; 1108 alloc_max = 0x000000000000ffffllu; 1109 break; 1110 } 1111 1112 DataLayout target_data(&llvm_module); 1113 if (target_data.getPointerSize(0) != target_info.address_byte_size) 1114 { 1115 err.SetErrorToGenericError(); 1116 err.SetErrorString(interpreter_initialization_error); 1117 return false; 1118 } 1119 if (target_data.isLittleEndian() != (target_info.byte_order == lldb::eByteOrderLittle)) 1120 { 1121 err.SetErrorToGenericError(); 1122 err.SetErrorString(interpreter_initialization_error); 1123 return false; 1124 } 1125 1126 Memory memory(target_data, m_decl_map, alloc_min, alloc_max); 1127 InterpreterStackFrame frame(target_data, memory, m_decl_map); 1128 1129 uint32_t num_insts = 0; 1130 1131 frame.Jump(llvm_function.begin()); 1132 1133 while (frame.m_ii != frame.m_ie && (++num_insts < 4096)) 1134 { 1135 const Instruction *inst = frame.m_ii; 1136 1137 if (log) 1138 log->Printf("Interpreting %s", PrintValue(inst).c_str()); 1139 1140 switch (inst->getOpcode()) 1141 { 1142 default: 1143 break; 1144 case Instruction::Add: 1145 case Instruction::Sub: 1146 case Instruction::Mul: 1147 case Instruction::SDiv: 1148 case Instruction::UDiv: 1149 case Instruction::SRem: 1150 case Instruction::URem: 1151 case Instruction::Shl: 1152 case Instruction::LShr: 1153 case Instruction::AShr: 1154 case Instruction::And: 1155 case Instruction::Or: 1156 case Instruction::Xor: 1157 { 1158 const BinaryOperator *bin_op = dyn_cast<BinaryOperator>(inst); 1159 1160 if (!bin_op) 1161 { 1162 if (log) 1163 log->Printf("getOpcode() returns %s, but instruction is not a BinaryOperator", inst->getOpcodeName()); 1164 err.SetErrorToGenericError(); 1165 err.SetErrorString(interpreter_internal_error); 1166 return false; 1167 } 1168 1169 Value *lhs = inst->getOperand(0); 1170 Value *rhs = inst->getOperand(1); 1171 1172 lldb_private::Scalar L; 1173 lldb_private::Scalar R; 1174 1175 if (!frame.EvaluateValue(L, lhs, llvm_module)) 1176 { 1177 if (log) 1178 log->Printf("Couldn't evaluate %s", PrintValue(lhs).c_str()); 1179 err.SetErrorToGenericError(); 1180 err.SetErrorString(bad_value_error); 1181 return false; 1182 } 1183 1184 if (!frame.EvaluateValue(R, rhs, llvm_module)) 1185 { 1186 if (log) 1187 log->Printf("Couldn't evaluate %s", PrintValue(rhs).c_str()); 1188 err.SetErrorToGenericError(); 1189 err.SetErrorString(bad_value_error); 1190 return false; 1191 } 1192 1193 lldb_private::Scalar result; 1194 1195 switch (inst->getOpcode()) 1196 { 1197 default: 1198 break; 1199 case Instruction::Add: 1200 result = L + R; 1201 break; 1202 case Instruction::Mul: 1203 result = L * R; 1204 break; 1205 case Instruction::Sub: 1206 result = L - R; 1207 break; 1208 case Instruction::SDiv: 1209 result = L / R; 1210 break; 1211 case Instruction::UDiv: 1212 result = L.GetRawBits64(0) / R.GetRawBits64(1); 1213 break; 1214 case Instruction::SRem: 1215 result = L % R; 1216 break; 1217 case Instruction::URem: 1218 result = L.GetRawBits64(0) % R.GetRawBits64(1); 1219 break; 1220 case Instruction::Shl: 1221 result = L << R; 1222 break; 1223 case Instruction::AShr: 1224 result = L >> R; 1225 break; 1226 case Instruction::LShr: 1227 result = L; 1228 result.ShiftRightLogical(R); 1229 break; 1230 case Instruction::And: 1231 result = L & R; 1232 break; 1233 case Instruction::Or: 1234 result = L | R; 1235 break; 1236 case Instruction::Xor: 1237 result = L ^ R; 1238 break; 1239 } 1240 1241 frame.AssignValue(inst, result, llvm_module); 1242 1243 if (log) 1244 { 1245 log->Printf("Interpreted a %s", inst->getOpcodeName()); 1246 log->Printf(" L : %s", frame.SummarizeValue(lhs).c_str()); 1247 log->Printf(" R : %s", frame.SummarizeValue(rhs).c_str()); 1248 log->Printf(" = : %s", frame.SummarizeValue(inst).c_str()); 1249 } 1250 } 1251 break; 1252 case Instruction::Alloca: 1253 { 1254 const AllocaInst *alloca_inst = dyn_cast<AllocaInst>(inst); 1255 1256 if (!alloca_inst) 1257 { 1258 if (log) 1259 log->Printf("getOpcode() returns Alloca, but instruction is not an AllocaInst"); 1260 err.SetErrorToGenericError(); 1261 err.SetErrorString(interpreter_internal_error); 1262 return false; 1263 } 1264 1265 if (alloca_inst->isArrayAllocation()) 1266 { 1267 if (log) 1268 log->Printf("AllocaInsts are not handled if isArrayAllocation() is true"); 1269 err.SetErrorToGenericError(); 1270 err.SetErrorString(unsupported_opcode_error); 1271 return false; 1272 } 1273 1274 // The semantics of Alloca are: 1275 // Create a region R of virtual memory of type T, backed by a data buffer 1276 // Create a region P of virtual memory of type T*, backed by a data buffer 1277 // Write the virtual address of R into P 1278 1279 Type *T = alloca_inst->getAllocatedType(); 1280 Type *Tptr = alloca_inst->getType(); 1281 1282 Memory::Region R = memory.Malloc(T); 1283 1284 if (R.IsInvalid()) 1285 { 1286 if (log) 1287 log->Printf("Couldn't allocate memory for an AllocaInst"); 1288 err.SetErrorToGenericError(); 1289 err.SetErrorString(memory_allocation_error); 1290 return false; 1291 } 1292 1293 Memory::Region P = memory.Malloc(Tptr); 1294 1295 if (P.IsInvalid()) 1296 { 1297 if (log) 1298 log->Printf("Couldn't allocate the result pointer for an AllocaInst"); 1299 err.SetErrorToGenericError(); 1300 err.SetErrorString(memory_allocation_error); 1301 return false; 1302 } 1303 1304 DataEncoderSP P_encoder = memory.GetEncoder(P); 1305 1306 if (P_encoder->PutAddress(0, R.m_base) == UINT32_MAX) 1307 { 1308 if (log) 1309 log->Printf("Couldn't write the result pointer for an AllocaInst"); 1310 err.SetErrorToGenericError(); 1311 err.SetErrorString(memory_write_error); 1312 return false; 1313 } 1314 1315 frame.m_values[alloca_inst] = P; 1316 1317 if (log) 1318 { 1319 log->Printf("Interpreted an AllocaInst"); 1320 log->Printf(" R : %s", memory.SummarizeRegion(R).c_str()); 1321 log->Printf(" P : %s", frame.SummarizeValue(alloca_inst).c_str()); 1322 } 1323 } 1324 break; 1325 case Instruction::BitCast: 1326 case Instruction::ZExt: 1327 { 1328 const CastInst *cast_inst = dyn_cast<CastInst>(inst); 1329 1330 if (!cast_inst) 1331 { 1332 if (log) 1333 log->Printf("getOpcode() returns %s, but instruction is not a BitCastInst", cast_inst->getOpcodeName()); 1334 err.SetErrorToGenericError(); 1335 err.SetErrorString(interpreter_internal_error); 1336 return false; 1337 } 1338 1339 Value *source = cast_inst->getOperand(0); 1340 1341 lldb_private::Scalar S; 1342 1343 if (!frame.EvaluateValue(S, source, llvm_module)) 1344 { 1345 if (log) 1346 log->Printf("Couldn't evaluate %s", PrintValue(source).c_str()); 1347 err.SetErrorToGenericError(); 1348 err.SetErrorString(bad_value_error); 1349 return false; 1350 } 1351 1352 frame.AssignValue(inst, S, llvm_module); 1353 } 1354 break; 1355 case Instruction::Br: 1356 { 1357 const BranchInst *br_inst = dyn_cast<BranchInst>(inst); 1358 1359 if (!br_inst) 1360 { 1361 if (log) 1362 log->Printf("getOpcode() returns Br, but instruction is not a BranchInst"); 1363 err.SetErrorToGenericError(); 1364 err.SetErrorString(interpreter_internal_error); 1365 return false; 1366 } 1367 1368 if (br_inst->isConditional()) 1369 { 1370 Value *condition = br_inst->getCondition(); 1371 1372 lldb_private::Scalar C; 1373 1374 if (!frame.EvaluateValue(C, condition, llvm_module)) 1375 { 1376 if (log) 1377 log->Printf("Couldn't evaluate %s", PrintValue(condition).c_str()); 1378 err.SetErrorToGenericError(); 1379 err.SetErrorString(bad_value_error); 1380 return false; 1381 } 1382 1383 if (C.GetRawBits64(0)) 1384 frame.Jump(br_inst->getSuccessor(0)); 1385 else 1386 frame.Jump(br_inst->getSuccessor(1)); 1387 1388 if (log) 1389 { 1390 log->Printf("Interpreted a BrInst with a condition"); 1391 log->Printf(" cond : %s", frame.SummarizeValue(condition).c_str()); 1392 } 1393 } 1394 else 1395 { 1396 frame.Jump(br_inst->getSuccessor(0)); 1397 1398 if (log) 1399 { 1400 log->Printf("Interpreted a BrInst with no condition"); 1401 } 1402 } 1403 } 1404 continue; 1405 case Instruction::GetElementPtr: 1406 { 1407 const GetElementPtrInst *gep_inst = dyn_cast<GetElementPtrInst>(inst); 1408 1409 if (!gep_inst) 1410 { 1411 if (log) 1412 log->Printf("getOpcode() returns GetElementPtr, but instruction is not a GetElementPtrInst"); 1413 err.SetErrorToGenericError(); 1414 err.SetErrorString(interpreter_internal_error); 1415 return false; 1416 } 1417 1418 const Value *pointer_operand = gep_inst->getPointerOperand(); 1419 Type *pointer_type = pointer_operand->getType(); 1420 1421 lldb_private::Scalar P; 1422 1423 if (!frame.EvaluateValue(P, pointer_operand, llvm_module)) 1424 { 1425 if (log) 1426 log->Printf("Couldn't evaluate %s", PrintValue(pointer_operand).c_str()); 1427 err.SetErrorToGenericError(); 1428 err.SetErrorString(bad_value_error); 1429 return false; 1430 } 1431 1432 typedef SmallVector <Value *, 8> IndexVector; 1433 typedef IndexVector::iterator IndexIterator; 1434 1435 SmallVector <Value *, 8> indices (gep_inst->idx_begin(), 1436 gep_inst->idx_end()); 1437 1438 SmallVector <Value *, 8> const_indices; 1439 1440 for (IndexIterator ii = indices.begin(), ie = indices.end(); 1441 ii != ie; 1442 ++ii) 1443 { 1444 ConstantInt *constant_index = dyn_cast<ConstantInt>(*ii); 1445 1446 if (!constant_index) 1447 { 1448 lldb_private::Scalar I; 1449 1450 if (!frame.EvaluateValue(I, *ii, llvm_module)) 1451 { 1452 if (log) 1453 log->Printf("Couldn't evaluate %s", PrintValue(*ii).c_str()); 1454 err.SetErrorToGenericError(); 1455 err.SetErrorString(bad_value_error); 1456 return false; 1457 } 1458 1459 if (log) 1460 log->Printf("Evaluated constant index %s as %llu", PrintValue(*ii).c_str(), I.ULongLong(LLDB_INVALID_ADDRESS)); 1461 1462 constant_index = cast<ConstantInt>(ConstantInt::get((*ii)->getType(), I.ULongLong(LLDB_INVALID_ADDRESS))); 1463 } 1464 1465 const_indices.push_back(constant_index); 1466 } 1467 1468 uint64_t offset = target_data.getIndexedOffset(pointer_type, const_indices); 1469 1470 lldb_private::Scalar Poffset = P + offset; 1471 1472 frame.AssignValue(inst, Poffset, llvm_module); 1473 1474 if (log) 1475 { 1476 log->Printf("Interpreted a GetElementPtrInst"); 1477 log->Printf(" P : %s", frame.SummarizeValue(pointer_operand).c_str()); 1478 log->Printf(" Poffset : %s", frame.SummarizeValue(inst).c_str()); 1479 } 1480 } 1481 break; 1482 case Instruction::ICmp: 1483 { 1484 const ICmpInst *icmp_inst = dyn_cast<ICmpInst>(inst); 1485 1486 if (!icmp_inst) 1487 { 1488 if (log) 1489 log->Printf("getOpcode() returns ICmp, but instruction is not an ICmpInst"); 1490 err.SetErrorToGenericError(); 1491 err.SetErrorString(interpreter_internal_error); 1492 return false; 1493 } 1494 1495 CmpInst::Predicate predicate = icmp_inst->getPredicate(); 1496 1497 Value *lhs = inst->getOperand(0); 1498 Value *rhs = inst->getOperand(1); 1499 1500 lldb_private::Scalar L; 1501 lldb_private::Scalar R; 1502 1503 if (!frame.EvaluateValue(L, lhs, llvm_module)) 1504 { 1505 if (log) 1506 log->Printf("Couldn't evaluate %s", PrintValue(lhs).c_str()); 1507 err.SetErrorToGenericError(); 1508 err.SetErrorString(bad_value_error); 1509 return false; 1510 } 1511 1512 if (!frame.EvaluateValue(R, rhs, llvm_module)) 1513 { 1514 if (log) 1515 log->Printf("Couldn't evaluate %s", PrintValue(rhs).c_str()); 1516 err.SetErrorToGenericError(); 1517 err.SetErrorString(bad_value_error); 1518 return false; 1519 } 1520 1521 lldb_private::Scalar result; 1522 1523 switch (predicate) 1524 { 1525 default: 1526 return false; 1527 case CmpInst::ICMP_EQ: 1528 result = (L == R); 1529 break; 1530 case CmpInst::ICMP_NE: 1531 result = (L != R); 1532 break; 1533 case CmpInst::ICMP_UGT: 1534 result = (L.GetRawBits64(0) > R.GetRawBits64(0)); 1535 break; 1536 case CmpInst::ICMP_UGE: 1537 result = (L.GetRawBits64(0) >= R.GetRawBits64(0)); 1538 break; 1539 case CmpInst::ICMP_ULT: 1540 result = (L.GetRawBits64(0) < R.GetRawBits64(0)); 1541 break; 1542 case CmpInst::ICMP_ULE: 1543 result = (L.GetRawBits64(0) <= R.GetRawBits64(0)); 1544 break; 1545 case CmpInst::ICMP_SGT: 1546 result = (L > R); 1547 break; 1548 case CmpInst::ICMP_SGE: 1549 result = (L >= R); 1550 break; 1551 case CmpInst::ICMP_SLT: 1552 result = (L < R); 1553 break; 1554 case CmpInst::ICMP_SLE: 1555 result = (L <= R); 1556 break; 1557 } 1558 1559 frame.AssignValue(inst, result, llvm_module); 1560 1561 if (log) 1562 { 1563 log->Printf("Interpreted an ICmpInst"); 1564 log->Printf(" L : %s", frame.SummarizeValue(lhs).c_str()); 1565 log->Printf(" R : %s", frame.SummarizeValue(rhs).c_str()); 1566 log->Printf(" = : %s", frame.SummarizeValue(inst).c_str()); 1567 } 1568 } 1569 break; 1570 case Instruction::IntToPtr: 1571 { 1572 const IntToPtrInst *int_to_ptr_inst = dyn_cast<IntToPtrInst>(inst); 1573 1574 if (!int_to_ptr_inst) 1575 { 1576 if (log) 1577 log->Printf("getOpcode() returns IntToPtr, but instruction is not an IntToPtrInst"); 1578 err.SetErrorToGenericError(); 1579 err.SetErrorString(interpreter_internal_error); 1580 return false; 1581 } 1582 1583 Value *src_operand = int_to_ptr_inst->getOperand(0); 1584 1585 lldb_private::Scalar I; 1586 1587 if (!frame.EvaluateValue(I, src_operand, llvm_module)) 1588 { 1589 if (log) 1590 log->Printf("Couldn't evaluate %s", PrintValue(src_operand).c_str()); 1591 err.SetErrorToGenericError(); 1592 err.SetErrorString(bad_value_error); 1593 return false; 1594 } 1595 1596 frame.AssignValue(inst, I, llvm_module); 1597 1598 if (log) 1599 { 1600 log->Printf("Interpreted an IntToPtr"); 1601 log->Printf(" Src : %s", frame.SummarizeValue(src_operand).c_str()); 1602 log->Printf(" = : %s", frame.SummarizeValue(inst).c_str()); 1603 } 1604 } 1605 break; 1606 case Instruction::PtrToInt: 1607 { 1608 const PtrToIntInst *ptr_to_int_inst = dyn_cast<PtrToIntInst>(inst); 1609 1610 if (!ptr_to_int_inst) 1611 { 1612 if (log) 1613 log->Printf("getOpcode() returns PtrToInt, but instruction is not an PtrToIntInst"); 1614 err.SetErrorToGenericError(); 1615 err.SetErrorString(interpreter_internal_error); 1616 return false; 1617 } 1618 1619 Value *src_operand = ptr_to_int_inst->getOperand(0); 1620 1621 lldb_private::Scalar I; 1622 1623 if (!frame.EvaluateValue(I, src_operand, llvm_module)) 1624 { 1625 if (log) 1626 log->Printf("Couldn't evaluate %s", PrintValue(src_operand).c_str()); 1627 err.SetErrorToGenericError(); 1628 err.SetErrorString(bad_value_error); 1629 return false; 1630 } 1631 1632 frame.AssignValue(inst, I, llvm_module); 1633 1634 if (log) 1635 { 1636 log->Printf("Interpreted a PtrToInt"); 1637 log->Printf(" Src : %s", frame.SummarizeValue(src_operand).c_str()); 1638 log->Printf(" = : %s", frame.SummarizeValue(inst).c_str()); 1639 } 1640 } 1641 break; 1642 case Instruction::Load: 1643 { 1644 const LoadInst *load_inst = dyn_cast<LoadInst>(inst); 1645 1646 if (!load_inst) 1647 { 1648 if (log) 1649 log->Printf("getOpcode() returns Load, but instruction is not a LoadInst"); 1650 err.SetErrorToGenericError(); 1651 err.SetErrorString(interpreter_internal_error); 1652 return false; 1653 } 1654 1655 // The semantics of Load are: 1656 // Create a region D that will contain the loaded data 1657 // Resolve the region P containing a pointer 1658 // Dereference P to get the region R that the data should be loaded from 1659 // Transfer a unit of type type(D) from R to D 1660 1661 const Value *pointer_operand = load_inst->getPointerOperand(); 1662 1663 Type *pointer_ty = pointer_operand->getType(); 1664 PointerType *pointer_ptr_ty = dyn_cast<PointerType>(pointer_ty); 1665 if (!pointer_ptr_ty) 1666 { 1667 if (log) 1668 log->Printf("getPointerOperand()->getType() is not a PointerType"); 1669 err.SetErrorToGenericError(); 1670 err.SetErrorString(interpreter_internal_error); 1671 return false; 1672 } 1673 Type *target_ty = pointer_ptr_ty->getElementType(); 1674 1675 Memory::Region D = frame.ResolveValue(load_inst, llvm_module); 1676 Memory::Region P = frame.ResolveValue(pointer_operand, llvm_module); 1677 1678 if (D.IsInvalid()) 1679 { 1680 if (log) 1681 log->Printf("LoadInst's value doesn't resolve to anything"); 1682 err.SetErrorToGenericError(); 1683 err.SetErrorString(bad_value_error); 1684 return false; 1685 } 1686 1687 if (P.IsInvalid()) 1688 { 1689 if (log) 1690 log->Printf("LoadInst's pointer doesn't resolve to anything"); 1691 err.SetErrorToGenericError(); 1692 err.SetErrorString(bad_value_error); 1693 return false; 1694 } 1695 1696 DataExtractorSP P_extractor(memory.GetExtractor(P)); 1697 DataEncoderSP D_encoder(memory.GetEncoder(D)); 1698 1699 lldb::offset_t offset = 0; 1700 lldb::addr_t pointer = P_extractor->GetAddress(&offset); 1701 1702 Memory::Region R = memory.Lookup(pointer, target_ty); 1703 1704 if (R.IsValid()) 1705 { 1706 if (!memory.Read(D_encoder->GetDataStart(), R.m_base, target_data.getTypeStoreSize(target_ty))) 1707 { 1708 if (log) 1709 log->Printf("Couldn't read from a region on behalf of a LoadInst"); 1710 err.SetErrorToGenericError(); 1711 err.SetErrorString(memory_read_error); 1712 return false; 1713 } 1714 } 1715 else 1716 { 1717 if (!memory.ReadFromRawPtr(D_encoder->GetDataStart(), pointer, target_data.getTypeStoreSize(target_ty))) 1718 { 1719 if (log) 1720 log->Printf("Couldn't read from a raw pointer on behalf of a LoadInst"); 1721 err.SetErrorToGenericError(); 1722 err.SetErrorString(memory_read_error); 1723 return false; 1724 } 1725 } 1726 1727 if (log) 1728 { 1729 log->Printf("Interpreted a LoadInst"); 1730 log->Printf(" P : %s", frame.SummarizeValue(pointer_operand).c_str()); 1731 if (R.IsValid()) 1732 log->Printf(" R : %s", memory.SummarizeRegion(R).c_str()); 1733 else 1734 log->Printf(" R : raw pointer 0x%llx", (unsigned long long)pointer); 1735 log->Printf(" D : %s", frame.SummarizeValue(load_inst).c_str()); 1736 } 1737 } 1738 break; 1739 case Instruction::Ret: 1740 { 1741 if (result_name.IsEmpty()) 1742 return true; 1743 1744 GlobalValue *result_value = llvm_module.getNamedValue(result_name.GetCString()); 1745 1746 if (!frame.ConstructResult(result, result_value, result_name, result_type, llvm_module)) 1747 { 1748 if (log) 1749 log->Printf("Couldn't construct the expression's result"); 1750 err.SetErrorToGenericError(); 1751 err.SetErrorString(bad_result_error); 1752 return false; 1753 } 1754 1755 return true; 1756 } 1757 case Instruction::Store: 1758 { 1759 const StoreInst *store_inst = dyn_cast<StoreInst>(inst); 1760 1761 if (!store_inst) 1762 { 1763 if (log) 1764 log->Printf("getOpcode() returns Store, but instruction is not a StoreInst"); 1765 err.SetErrorToGenericError(); 1766 err.SetErrorString(interpreter_internal_error); 1767 return false; 1768 } 1769 1770 // The semantics of Store are: 1771 // Resolve the region D containing the data to be stored 1772 // Resolve the region P containing a pointer 1773 // Dereference P to get the region R that the data should be stored in 1774 // Transfer a unit of type type(D) from D to R 1775 1776 const Value *value_operand = store_inst->getValueOperand(); 1777 const Value *pointer_operand = store_inst->getPointerOperand(); 1778 1779 Type *pointer_ty = pointer_operand->getType(); 1780 PointerType *pointer_ptr_ty = dyn_cast<PointerType>(pointer_ty); 1781 if (!pointer_ptr_ty) 1782 return false; 1783 Type *target_ty = pointer_ptr_ty->getElementType(); 1784 1785 Memory::Region D = frame.ResolveValue(value_operand, llvm_module); 1786 Memory::Region P = frame.ResolveValue(pointer_operand, llvm_module); 1787 1788 if (D.IsInvalid()) 1789 { 1790 if (log) 1791 log->Printf("StoreInst's value doesn't resolve to anything"); 1792 err.SetErrorToGenericError(); 1793 err.SetErrorString(bad_value_error); 1794 return false; 1795 } 1796 1797 if (P.IsInvalid()) 1798 { 1799 if (log) 1800 log->Printf("StoreInst's pointer doesn't resolve to anything"); 1801 err.SetErrorToGenericError(); 1802 err.SetErrorString(bad_value_error); 1803 return false; 1804 } 1805 1806 DataExtractorSP P_extractor(memory.GetExtractor(P)); 1807 DataExtractorSP D_extractor(memory.GetExtractor(D)); 1808 1809 if (!P_extractor || !D_extractor) 1810 return false; 1811 1812 lldb::offset_t offset = 0; 1813 lldb::addr_t pointer = P_extractor->GetAddress(&offset); 1814 1815 Memory::Region R = memory.Lookup(pointer, target_ty); 1816 1817 if (R.IsValid()) 1818 { 1819 if (!memory.Write(R.m_base, D_extractor->GetDataStart(), target_data.getTypeStoreSize(target_ty))) 1820 { 1821 if (log) 1822 log->Printf("Couldn't write to a region on behalf of a LoadInst"); 1823 err.SetErrorToGenericError(); 1824 err.SetErrorString(memory_write_error); 1825 return false; 1826 } 1827 } 1828 else 1829 { 1830 if (!memory.WriteToRawPtr(pointer, D_extractor->GetDataStart(), target_data.getTypeStoreSize(target_ty))) 1831 { 1832 if (log) 1833 log->Printf("Couldn't write to a raw pointer on behalf of a LoadInst"); 1834 err.SetErrorToGenericError(); 1835 err.SetErrorString(memory_write_error); 1836 return false; 1837 } 1838 } 1839 1840 1841 if (log) 1842 { 1843 log->Printf("Interpreted a StoreInst"); 1844 log->Printf(" D : %s", frame.SummarizeValue(value_operand).c_str()); 1845 log->Printf(" P : %s", frame.SummarizeValue(pointer_operand).c_str()); 1846 log->Printf(" R : %s", memory.SummarizeRegion(R).c_str()); 1847 } 1848 } 1849 break; 1850 } 1851 1852 ++frame.m_ii; 1853 } 1854 1855 if (num_insts >= 4096) 1856 { 1857 err.SetErrorToGenericError(); 1858 err.SetErrorString(infinite_loop_error); 1859 return false; 1860 } 1861 1862 return false; 1863 } 1864